Summary of all summary function definitions and usage

All background properties cannot be inherited. 1. Background-color all elements can set the background color. The default value for Background-color is transparent; that is, if an element does not specify a background color, the background is transparent so that the background of its ancestor elements is visible. 2. Background-image all elements can set the background image, the background image can be set multiple, the middle separated by commas, the background image will be stacked, written in front of the level above. 3. Background-repeatrepeat (default)/no-repeat/repeat-x/Repeat-y4. Background-attachmentscroll (default)/fixed 5. Background-position Pixel method: Take the upper left corner of the image as the starting point, the first value is the distance moved horizontally, the second value is the distance of the vertical movement; if only one value is specified, the second value defaults to 50%. Percent method: The percentages are applied to both the image and the element, and the corresponding

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